This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X400S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X400S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X400S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X400S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X400S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X400S
The AirTAC B04-SID40X400S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, yielding equal force in both directions (528 N at 0.5 MPa). The B04- prefix marks this as a construction-machinery dedicated variant, mechanically identical to the standard SID40X400S. It features a 40 mm bore, G1/4 port, M12x1.25 rod thread, and a 400 mm stroke. This SID model is discontinued; the direct replacement is the SAID40X400S, sharing the same interface, bore, stroke, and mounting.
The SAI upgrade features an improved piston seal with two Y-shaped one-way elements for low start-up pressure and long life. Because both faces use the rod-side area, push and pull forces match exactly. The built-in magnet (-S) supports legacy CS1-B/DS1-B switches. A plain cylinder drifts on air loss; cushions only decelerate, so use an external rod lock for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X400S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X400S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X400S |
| Bore size | Ø40 mm |
| Stroke | 400 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAID40X400S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The B04-SAID40X400S produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X400S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×400 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X400S Is Used
Excavator Linkage Control
Drives dual-tool mechanisms on heavy equipment where equal push and pull force prevents linkage binding during repetitive digging cycles.
Loader Material Diversion
Actuates diverter gates on construction site conveyors, using the back rod end to carry a sensor cam for position feedback.
Crane Load Centering
Centers heavy pallets of building materials by pushing equally from both faces, ensuring stable alignment without rotational drift.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X400S with the B04-SAID40X400S
To replace the discontinued B04-SID40X400S, specify the SAID40X400S, which provides a direct solution matching the ISO 15552 mounting interface, G1/4 port, and 400 mm stroke. Size both ways by checking neighboring bores if higher force is needed, but remember the double-rod design provides equal push and pull force (739 N at 0.7 MPa). A double rod is right when you need anti-rotation stability or must drive two tools simultaneously. Mounting options include Basic, FA, LB, and TC. The -S suffix ensures a piston magnet for sensors. Because the 400 mm stroke exceeds 300 mm, verify side-load limits and add external guides to prevent rod bending.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X400S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X400S FAQ
Yes, the B04-SID40X400S is discontinued. The direct replacement is the SAID40X400S. The B04- prefix simply marks it as construction-machinery dedicated; mechanically it is identical to the SID40X400S. The SAID replacement shares the same ISO 15552 interface, 40 mm bore, 400 mm stroke, G1/4 port, and mounting.
Force is equal both ways: 528 N at 0.5 MPa, 739 N at 0.7 MPa, and 950 N at 0.9 MPa. Speed ranges from 30 to 800 mm/s. It uses a G1/4 port and M12x1.25 rod thread. Note that air cushions only decelerate near stroke end; for load holding on air loss, use an external rod lock or SAIL/BSAI variant.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID40X400S
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